Loader

ABSTRACT

The present disclosure relates to a loader, including: a frame, including a chassis, and a bearing portion mounted above the chassis; a cab, mounted on the chassis and located in front of the bearing portion; a movable arm, including a front end located in front of the cab, and a rear end located at a rear part of the frame; a rear connecting rod, including a first end hinged with the bearing portion, and a second end hinged with the movable arm; a front connecting rod, including a first end hinged with the bearing portion, and a second end hinged withe movable arm; and a hydraulic cylinder, including a first end hinged with the bearing portion, and a second end hinged with the movable arm, so as to drive the front end of the movable arm to switch between a lower position and a upper position. The bearing portion is located below a rear window of the cab or at a side part of the rear window. By applying the technical solution of the present disclosure, the bearing portion is positioned below the rear window of the cab or located at the side part of the rear window, so that the problem of poor rear view of a skid steer loader in the related art is solved.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure is based on and claims priority to CN applicationNo. CN202010757226.1, filed on Jul. 31, 2020, the disclosure of which ishereby incorporated by reference in its entirety.

FIELD OF THE DISCLOSURE

The present disclosure relates to the field of engineering machinery,and in particular, to a loader.

BACKGROUND OF THE DISCLOSURE

A skid steer loader is special wheel type chassis equipment forrealizing vehicle steering by utilizing a linear velocity difference ofwheels at two sides, and is mainly applied to occasions with a narrowoperation place, uneven ground and frequent operation content change.

A lifting mechanism for lifting a bucket of a traditional skid steerloader adopts radial lifting. Specifically, a rear end of a movable armis hinged with a frame, and the bucket is connected to a front end ofthe movable arm. Under the action of a driving oil cylinder, the frontend of the movable arm moves around an arc taking a hinge point of themovable arm and the frame as a circle center, the front end of themovable arm extends forwards in a horizontal direction and then movesbackwards, and the lifting mechanism has the disadvantages of lowlifting capacity and small lifting height. In order to improve theproblems, a skid mainstream manufacturer discloses a vertical liftingworking device, that is, the front end of a movable arm is similar to avertical trajectory in the lifting process through the design of acomplex connecting rod mechanism, the lifting height is increased, andthe rated load capacity is enhanced.

The skid steer loader with a vertical lifting device mechanism ispresent in the related art, but the skid steer loader with the verticallifting device mechanism in the related art has a problem of poordriver's rear view, that is, the lifting mechanism is between the upperrear part of the frame and the rear part of the cab, thereby greatlyaffecting the driver's rear view. The multifunctionality of the skidsteer loader is reflected in that different machines can be easily hungat the front end of the skid steer loader to work, but part of thecommon machines and tools need to work under the condition that the skidsteer loader is reversed, for example, a closed type sweeper and aditcher. When the skid steer loader works backwards, a driver needs toobserve the view of the rear part of the whole machine through a rearwindow of a cab at any time. Therefore, the existing vertical liftingworking device of the skid steer loader is generally higher in rearstructural design, which greatly shields the view field of a rear windowof a driver and has a view field blind area, resulting in a great riskin the backing operation process.

SUMMARY OF THE DISCLOSURE

The present disclosure aims to provide a loader to improve the problemof poor rear view of the loader in related art

According to one aspect of embodiments of the present disclosure, aloader is provided. The loader includes:

-   -   a frame, including a chassis, and a bearing portion mounted        above the chassis;    -   a cab, mounted on the chassis and located in front of the        bearing portion;    -   a movable arm, including a front end located in front of the        cab, and a rear end located at a rear part of the frame;    -   a rear connecting rod, including a first end hinged with the        bearing portion, and a second end hinged with the movable arm;    -   a front connecting rod, including a first end hinged with the        bearing portion, and a second end hinged with the movable arm;        and    -   a hydraulic cylinder rod, including a first end hinged with the        bearing portion, and a second end hinged with the movable arm,        so as to drive the front end of the movable arm to switch        between a lower position and an upper position,    -   wherein the bearing portion is located below a rear window of        the cab or at a side part of the rear window.

In some embodiments, the bearing portion includes:

-   -   a first bearing portion, wherein an upper end of the first        bearing portion and the first end of the rear connecting rod are        hinged at a first hinge point, and the first bearing portion is        lower than the rear window of the cab; and/or    -   a second bearing portion, wherein an upper end of the second        bearing portion and the first end of the front connecting rod        are hinged at a second hinge point, and the second bearing        portion is located at a side part of the rear window of the cab.

In some embodiments, the second bearing portion is located in front ofthe first bearing portion and adjacent to a rear wall of the cab.

In some embodiments, the second bearing portion is connected to a rearwall of the cab.

In some embodiments, the movable arm includes:

-   -   a first hinge portion, hinged with the second end of the rear        connecting rod;    -   a second hinge portion, hinged with the second end of the front        connecting rod; and    -   a third hinge portion, hinged with the second end of the        hydraulic cylinder,    -   wherein the first hinge portion, the second hinge portion and        the third hinge portion are arranged on the movable arm side by        side.

In some embodiments, the first hinge portion, the second hinge portionand the third hinge portion are arranged sequentially from back tofront.

In some embodiments, when the front end of the movable arm is located atthe lower position, in a horizontal and/or vertical direction, thesecond hinge portion is located between the first hinge point of thefirst end of the rear connecting rod and the bearing portion and thesecond hinge point of the first end of the front connecting rod and thebearing portion.

In some embodiments, when the front end of the movable arm is located atthe lower position, the second hinge portion is located rearward andbelow a connecting line of the first hinge portion and the second hingepoint of the first end of the front connecting rod and the bearingportion.

In some embodiments, when the front end of the movable arm is located atthe lower position, the second end of the rear connecting rod is locatedrearward and above the first end of the rear connecting rod; and whenthe front end of the movable arm is located at the lower position, thesecond end of the front connecting rod is located rearward and below thefirst end of the front connecting rod.

In some embodiments, when the front end of the movable arm is located atthe upper position, the second end of the rear connecting rod is locatedrearward and below the first end of the rear connecting rod; and whenthe front end of the movable arm is located at the upper position, thesecond end of the rear connecting rod is located rearward and above thefirst end of the front connecting rod.

In some embodiments, a third hinge point of the first end of thehydraulic cylinder and the bearing portion is located rearward and belowthe first hinge point of the first end of the rear connecting rod andthe bearing portion.

In some embodiments, the first hinge point of the first end of the rearconnecting rod and the bearing portion is located rearward and below thesecond hinge point of the first end of the front connecting rod and thebearing portion.

In some embodiments, the movable arm includes:

-   -   two arms, respectively located on two sides of the cab;    -   a first cross beam, connected to front ends of the two arms; and    -   a pedal, mounted on the first cross beam.

In some embodiments, during the movement of the front end of the movablearm from a first position to a second position, the rear connecting rodmoves counterclockwise first and then moves clockwise, and the frontconnecting rod moves clockwise all the time.

By applying the technical solution of the present disclosure, thebearing portion is positioned below the rear window of the cab orlocated at the side part of the rear window, so that the problem of poorrear view of the loader in the related art is solved.

Other features and advantages of the present disclosure will becomeapparent through the detailed description of exemplary embodiments ofthe present disclosure with reference to the following accompanyingdrawings.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The drawings as a part of the present disclosure are used to providefurther understanding of the present disclosure. Illustrativeembodiments of the present disclosure and description thereof are usedfor explaining the present disclosure but do not improperly limit thepresent disclosure. In the drawings:

FIG. 1 is a three-dimensional schematic diagram of a loader according toan embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram when a front end of a movablearm of a loader according to an embodiment of the present disclosure islocated at a lower position;

FIG. 3 is a schematic structural diagram when a front end of a movablearm of a loader according to an embodiment of the present disclosure islocated at an upper position;

FIG. 4 is a schematic structural diagram of a rear connecting rod of aloader according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a front connecting rod of aloader according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a movable arm of a loaderaccording to an embodiment of the present disclosure; and

FIG. 7 is a schematic diagram of a view field of a rear window of a cabof a loader according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The technical solutions in the embodiments of the present disclosure aredescribed clearly with reference to the accompanying drawings in theembodiments of the present disclosure. Apparently, the describedembodiments are merely some rather than all of the embodiments of thepresent disclosure. The following description of the at least oneexemplary embodiment is actually merely illustrative and neverconstitutes any limitation to the present disclosure and application oruse thereof. All other embodiments made based on the embodiments of thepresent disclosure by a person of ordinary skill in the art withoutpaying any creative effort shall be included in the protection scope ofthe present disclosure.

FIG. 1 is a three-dimensional schematic diagram of a loader according toan embodiment of the present disclosure. As shown in FIG. 1 , the loaderin this embodiment includes a frame 5, a cab 6, a movable arm 3, a rearconnecting rod 1, a front connecting rod 2, and a hydraulic cylinder 4.

The frame 5 includes a chassis, and a bearing portion mounted above thechassis; the cab 6 is mounted on the chassis and located in front of thebearing portion; the movable arm 3 includes a front end 34 located infront of the cab 6, and a rear end located at a rear part of the frame5; the rear connecting rod 1 includes a first end 11 hinged with thebearing portion, and a second end 12 hinged with the movable arm 3; thefront connecting rod 2 includes a first end 21 hinged with the bearingportion, and a second end 22 hinged withe movable arm 3; and thehydraulic cylinder 4 includes a first end 41 hinged with the bearingportion, and a second end 42 hinged with the movable arm 3, so as todrive the front end 34 of the movable arm 3 to switch between a lowerposition and a upper position.

As shown in FIG. 7 , the bearing portion is located below a rear window61 of the cab 6 or at a side part of the rear window 61, so that theproblem of poor rear view of the loader in related art is improved.

In this embodiment, the movable arm 3 and the frame 5 are connectedthrough a connecting rod mechanism, and in the lifting process of themovable arm 3, a trajectory 7 of the front end 34 of the movable arm 3is approximately a vertical straight line.

During the movement of the front end 34 of the movable arm 3 from afirst position to a second position, the rear connecting rod 1 movescounterclockwise first and then moves clockwise, and the frontconnecting rod 2 moves clockwise all the time.

The bearing portion includes a first bearing portion and a secondbearing portion, wherein an upper end of the first bearing portion and afirst end 11 of the rear connecting rod 1 are hinged at a first hingepoint 51, the first bearing portion is lower than the rear window 61 ofthe cab 6, an upper end of the second bearing portion and a first end 21of the front connecting rod 2 are hinged at a second hinge point 52, andthe second bearing portion is located at a side part of the rear window61 of the cab 6.

The second bearing portion is located in front of the first bearingportion and adjacent to a rear wall of the cab 6. The second bearingportion can play a role in protecting the rear window of the cab 6, andcan avoid serious deformation of the cab 6 under severe and dangerousconditions such as rollover to help a user escape from the rear window61.

In some embodiments, the second bearing portion is higher than the firstbearing portion. In some embodiments, the second bearing portion isconnected to a rear wall of the cab 6.

Referring to FIG. 1 to FIG. 6 , the movable arm 3 includes a first hingeportion 31, a second hinge portion 32, and a third hinge portion 33. Thefirst hinge portion 31 is hinged with a second end 12 of the rearconnecting rod 1; the second hinge portion 32 is hinged with a secondend 22 of the front connecting rod 2; and the third hinge portion 33 ishinged with a second end 42 of the hydraulic cylinder 4. The first hingeportion 31, the second hinge portion 32 and the third hinge portion 33are arranged on the movable arm 3 side by side.

The first hinge portion 31, the second hinge portion 32 and the thirdhinge portion 33 are arranged sequentially from back to front.

As shown in FIG. 1 and FIG. 2 , when the front end 34 of the movable arm3 is located at the lower position, in a horizontal direction and avertical direction, the second hinge portion 32 is located between thefirst hinge point 51 of the first end 11 of the rear connecting rod 1and the bearing portion and the second hinge point 52 of the first end21 of the front connecting rod 2 and the bearing portion.

When the front end 34 of the movable arm 3 is located at the lowerposition, the second hinge portion 32 is located below a connecting lineof the first hinge portion 31 and the second hinge point 52 of the firstend 21 of the front connecting rod 2 and the bearing portion.

When the front end 34 of the movable arm 3 is located at the lowerposition, the second end 12 of the rear connecting rod 1 is locatedrearward and above the first end 11 of the rear connecting rod 1; andwhen the front end 34 of the movable arm 3 is located at the lowerposition, the second end 22 of the front connecting rod 2 is locatedrearward and below the first end 21 of the front connecting rod 2.

As shown in FIG. 3 , when the front end 34 of the movable arm 3 islocated at the upper position, the second end 12 of the rear connectingrod 1 is located rearward and above the first end 11 of the rearconnecting rod 1; and when the front end 34 of the movable arm 3 islocated at the upper position, the second end 22 of the front connectingrod 2 is located rearward and above the first end 21 of the frontconnecting rod 2.

The third hinge point 53 of the first end of the hydraulic cylinder 4and the bearing portion is located below the first hinge point 51 of thefirst end 11 of the rear connecting rod 1 and the bearing portion.

The first hinge point 51 of the first end 11 of the rear connecting rod1 and the bearing portion is located behind the second hinge point 52 ofthe first end 21 of the front connecting rod 2 and the bearing portion,and the first hinge point 51 is lower than or the second hinge point 52or aligned with the second hinge point 52.

As shown in FIG. 6 , the movable arm 3 includes two arms, a first crossbeam 35 and a pedal 36. The two arms are respectively located on twosides of the cab 6; the first cross beam 35 is connected to front endsof the two arms; and the pedal 36 is mounted on the first cross beam 35.

When the front end 34 of the movable arm 3 is lifted from a lowerposition to an upper position under the driving of the hydrauliccylinder 4, the rear connecting rod 1 moves counterclockwise for a shorttime first and then moves clockwise, and the front connecting rod 2moves clockwise all the time.

When the front end 34 of the movable arm 3 is located at the lowerposition, the second end 12 of the rear connecting rod 1 is locatedrearward and above the first end 11 of the rear connecting rod 1, sothat the front end 34 of the movable arm 3 extends forwards at thebeginning of lifting and then ascends approximately vertically, which isbeneficial to the stability of low-position transportation.

The rear connecting rod 1 includes two rod-shaped parts at two ends in awidth direction of the loader, and a second cross beam 14 connecting thetwo rod-shaped parts, for connecting rear connecting rod-relatedstructures on two sides of a longitudinal center. The second cross beam35 is arranged at the front end of the movable arm 3, and the rearconnecting rod 1 and the cross beam on the movable arm 3 can well reducethe offset of the movable arm when the movable arm is laterally stressedand enhance the structural strength. The pedal 36 is arranged on thecross beam 35, thereby facilitating a driver to step into the cab from afront door.

Referring to FIG. 1 to FIG. 3 , the loader further includes a bucketrotatably mounted at the front end of the movable arm 3, and a hydrauliccylinder for driving the bucket to rotate relative to the movable arm 3.

The descriptions above are only exemplary embodiments of the presentdisclosure, but are not intended to limit the present disclosure; andany modifications, equivalent substitutions, improvements and the likemade within the spirit and principles of the present disclosure shouldbe all included in the protection scope of the present disclosure.

1. A loader, comprising: a frame, comprising a chassis (8), and abearing portion (5) mounted above the chassis (8); a cab (6), mounted onthe chassis (8) and located in front of the bearing portion (5); amovable arm (3), comprising a front end (34) located in front of the cab(6), and a rear end located at a rear part of the frame; a rearconnecting rod (1), comprising a first end (11) hinged with the bearingportion (5), and a second end (12) hinged with the movable arm (3); afront connecting rod (2), comprising a first end (21) hinged with thebearing portion (5), and a second end (22) hinged with the movable arm(3); and a hydraulic cylinder (4), comprising a first end (41) hingedwith the bearing portion (5), and a second end (42) hinged with themovable arm (3), so as to drive the front end (34) of the movable arm(3) to switch between a lower position and an upper position, whereinthe bearing portion (5) is located below a rear window (61) of the cab(6) or at a side part of the rear window (61).
 2. The loader accordingto claim 1, wherein the bearing portion (5) comprises: a first bearingportion, wherein an upper end of the first bearing portion and the firstend (11) of the rear connecting rod (1) are hinged at a first hingepoint (51), and the first bearing portion is lower than the rear window(61) of the cab (6); and/or a second bearing portion, wherein an upperend of the second bearing portion and the first end (21) of the frontconnecting rod (2) are hinged at a second hinge point (52), and thesecond bearing portion is located at the side part of the rear window(61) of the cab (6).
 3. The loader according to claim 1, wherein thesecond bearing portion is located in front of the first bearing portionand adjacent to a rear wall of the cab (6).
 4. The loader according toclaim 3, wherein the second bearing portion is connected to the rearwall of the cab (6).
 5. The loader according to claim 1, wherein themovable arm (3) comprises: a first hinge portion (31), hinged with thesecond end (12) of the rear connecting rod (1); a second hinge portion(32), hinged with the second end (22) of the front connecting rod (2);and a third hinge portion (33), hinged with the second end (42) of thehydraulic cylinder (4), wherein the first hinge portion (31), the secondhinge portion (32) and the third hinge portion (33) are arranged on themovable arm (3) side by side.
 6. The loader according to claim 5,wherein the first hinge portion (31), the second hinge portion (32) andthe third hinge portion (33) are arranged sequentially from back tofront.
 7. The loader according to claim 5, wherein when the front end(34) of the movable arm (3) is located at the lower position, in ahorizontal and/or vertical direction, the second hinge portion (32) islocated between the first hinge point (51) of the first end (11) of therear connecting rod (1) and the bearing portion and the second hingepoint (52) of the first end (21) of the front connecting rod (2) and thebearing portion (5).
 8. The loader according to claim 5, wherein whenthe front end (34) of the movable arm (3) is located at the lowerposition, the second hinge portion (32) is located below a connectingline between the first hinge portion (31) and the second hinge point(52) of the first end (21) of the front connecting rod (2) and thebearing portion (5).
 9. The loader according to claim 1, wherein whenthe front end (34) of the movable arm (3) is located at the lowerposition, the second end (12) of the rear connecting rod (1) is locatedrearward and above the first end (11) of the rear connecting rod (1);and when the front end (34) of the movable arm (3) is located at thelower position, the second end (22) of the front connecting rod (2) islocated rearward and below the first end (21) of the front connectingrod (2).
 10. The loader according to claim 1, wherein when the front end(34) of the movable arm (3) is located at the upper position, the secondend (12) of the rear connecting rod (1) is located rearward and abovethe first end (11) of the rear connecting rod (1); and when the frontend (34) of the movable arm (3) is located at the upper position, thesecond end (22) of the front connecting rod (2) is located rearward andabove the first end (21) of the front connecting rod (2).
 11. The loaderaccording to claim 1, wherein a third hinge point (53) of the first end(41) of the hydraulic cylinder (4) and the bearing portion (5) islocated rearward and below the first hinge point (51) of the first end(11) of the rear connecting rod (1) and the bearing portion (5).
 12. Theloader according to claim 1, wherein when the first hinge point (51) ofthe first end (11) of the rear connecting rod (1) and the bearingportion (5) is located rearward and below the second hinge point (52) ofthe first end (21) of the front connecting rod (2) and the bearingportion (5).
 13. The loader according to claim 1, wherein the movablearm (3) comprises: two arms, respectively located on two sides of thecab (6); a first cross beam (35), connected to front ends of the twoarms; and a pedal (36), mounted on the first cross beam (35).
 14. Theloader according to claim 1, wherein during the movement of the frontend (34) of the movable arm (3) from a first position to a secondposition, the rear connecting rod (1) moves counterclockwise first andthen moves clockwise, and the front connecting rod (2) moves clockwiseall the time.